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span.13Char
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span.3Char0
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span.4Char
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</head>

<body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'>

<div class=WordSection1 style='layout-grid:15.6pt'>

<p class=ab><a name="_Toc53320676"><span style='font-family:黑体'>程序</span><span
lang=EN-US>14-20 linux/include/linux/fs.h</span></a></p>

<div class=a align=center style='text-align:center'><span lang=EN-US>

<hr size=4 width="100%" align=center>

</span></div>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>1</span></u> <b><i>/*</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>2</span></u> <b><i>&nbsp;*
This file has definitions for some important file table</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>3</span></u> <b><i>&nbsp;*
structures etc.</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>4</span></u> <b><i>&nbsp;*/</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; /*</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span>本文件含有某些重要文件表结构的定义等。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; */</span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>5</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>6</span></u>
#ifndef <u><span style='color:blue'>_FS_H</span></u></span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>7</span></u>
#define <u><span style='color:blue'>_FS_H</span></u></span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>8</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>9</span></u>
#include &lt;sys/types.h&gt;&nbsp;&nbsp;&nbsp; // </span>类型头文件。定义了基本的系统数据类型。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>10</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>11</span></u> <b><i>/*
devices are as follows: (same as minix, so we can use the minix</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>12</span></u> <b><i>&nbsp;*
file system. These are major numbers.)</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>13</span></u> <b><i>&nbsp;*</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>14</span></u> <b><i>&nbsp;*
0 - unused (nodev)</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>15</span></u> <b><i>&nbsp;*
1 - /dev/mem</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>16</span></u> <b><i>&nbsp;*
2 - /dev/fd</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>17</span></u> <b><i>&nbsp;*
3 - /dev/hd</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>18</span></u> <b><i>&nbsp;*
4 - /dev/ttyx</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>19</span></u> <b><i>&nbsp;*
5 - /dev/tty</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>20</span></u> <b><i>&nbsp;*
6 - /dev/lp</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>21</span></u> <b><i>&nbsp;*
7 - unnamed pipes</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>22</span></u> <b><i>&nbsp;*/</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; /*</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span>系统所含的设备如下：（与<span
lang=EN-US>minix</span>系统的一样，所以我们可以使用<span lang=EN-US>minix</span>的</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span>文件系统。以下这些是主设备号。）</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; *</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * 0 - </span>没有用到（<span
lang=EN-US>nodev</span>）</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * 1 - /dev/mem &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span>内存设备。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * 2 - /dev/fd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>软盘设备。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * 3 - /dev/hd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>硬盘设备。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * 4 - /dev/ttyx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
tty</span>串行终端设备。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * 5 - /dev/tty&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
tty</span>终端设备。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * 6 - /dev/lp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>打印设备。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * 7 - unnamed pipes&nbsp;&nbsp;&nbsp;
</span>没有命名的管道。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; */</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>23</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>24</span></u>
#define <u><span style='color:blue'>IS_SEEKABLE</span></u>(<u><span
style='color:blue'>x</span></u>) ((<u><span style='color:blue'>x</span></u>)&gt;=1
&amp;&amp; (<u><span style='color:blue'>x</span></u>)&lt;=3)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>判断设备是否是可以寻找定位的。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>25</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>26</span></u>
#define <u><span style='color:blue'>READ</span></u> 0</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>27</span></u>
#define <u><span style='color:blue'>WRITE</span></u> 1</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>28</span></u>
#define <u><span style='color:blue'>READA</span></u>
2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b><i>/* read-ahead - don't
pause */</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>29</span></u>
#define <u><span style='color:blue'>WRITEA</span></u>
3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b><i>/* &quot;write-ahead&quot; -
silly, but somewhat useful */</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>30</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>31</span></u>
void <u><span style='color:blue'>buffer_init</span></u>(long
buffer_end);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>高速缓冲区初始化函数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>32</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>33</span></u>
#define <u><span style='color:blue'>MAJOR</span></u>(a)
(((unsigned)(a))&gt;&gt;8)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>取高字节（主设备号）。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>34</span></u>
#define <u><span style='color:blue'>MINOR</span></u>(a) ((a)&amp;0xff)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>取低字节（次设备号）。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>35</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>36</span></u>
#define <u><span style='color:blue'>NAME_LEN</span></u> 14&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>名字长度值。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>37</span></u>
#define <u><span style='color:blue'>ROOT_INO</span></u> 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>根<span lang=EN-US>i</span>节点。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>38</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>39</span></u>
#define <u><span style='color:blue'>I_MAP_SLOTS</span></u> 8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// i</span>节点位图槽数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>40</span></u>
#define <u><span style='color:blue'>Z_MAP_SLOTS</span></u> 8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>逻辑块（区段块）位图槽数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>41</span></u>
#define <u><span style='color:blue'>SUPER_MAGIC</span></u> 0x137F&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件系统魔数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>42</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>43</span></u>
#define <u><span style='color:blue'>NR_OPEN</span></u> 20&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>进程最多打开文件数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>44</span></u>
#define <u><span style='color:blue'>NR_INODE</span></u> 32&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>系统同时最多使用<span lang=EN-US>I</span>节点个数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>45</span></u>
#define <u><span style='color:blue'>NR_FILE</span></u> 64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>系统最多文件个数（文件数组项数）。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>46</span></u>
#define <u><span style='color:blue'>NR_SUPER</span></u> 8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>系统所含超级块个数（超级块数组项数）。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>47</span></u>
#define <u><span style='color:blue'>NR_HASH</span></u> 307&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>缓冲区<span lang=EN-US>Hash</span>表数组项数值。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>48</span></u>
#define <u><span style='color:blue'>NR_BUFFERS</span></u> <u><span
style='color:blue'>nr_buffers</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>系统所含缓冲块个数。初始化后不再改变。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>49</span></u>
#define <u><span style='color:blue'>BLOCK_SIZE</span></u> 1024&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>数据块长度（字节值）。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>50</span></u>
#define <u><span style='color:blue'>BLOCK_SIZE_BITS</span></u> 10&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>数据块长度所占比特位数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>51</span></u>
#ifndef <u><span style='color:blue'>NULL</span></u></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>52</span></u>
#define <u><span style='color:blue'>NULL</span></u> ((void *) 0)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>53</span></u>
#endif</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>54</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>每个逻辑块可存放的<span
lang=EN-US>i</span>节点数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>55</span></u>
#define <u><span style='color:blue'>INODES_PER_BLOCK</span></u> ((<u><span
style='color:blue'>BLOCK_SIZE</span></u>)/(sizeof (struct <u><span
style='color:blue'>d_inode</span></u>)))</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>每个逻辑块可存放的目录项数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>56</span></u>
#define <u><span style='color:blue'>DIR_ENTRIES_PER_BLOCK</span></u> ((<u><span
style='color:blue'>BLOCK_SIZE</span></u>)/(sizeof (struct <u><span
style='color:blue'>dir_entry</span></u>)))</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>57</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>管道头、管道尾、管道大小、管道空？、管道满？、管道头指针递增。</p>

<p class=a><span lang=EN-US style='color:blue'>&nbsp;<u>58</u></span><span
lang=EN-US> #define <u><span style='color:blue'>PIPE_READ_WAIT</span></u>(inode)
((inode).i_wait)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>59</span></u>
#define <u><span style='color:blue'>PIPE_WRITE_WAIT</span></u>(inode)
((inode).i_wait2)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>60</span></u><span
style='color:blue'> </span>#define <u><span style='color:blue'>PIPE_HEAD</span></u>(inode)
((inode).i_zone[0])</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>61</span></u>
#define <u><span style='color:blue'>PIPE_TAIL</span></u>(inode)
((inode).i_zone[1])</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>62</span></u>
#define <u><span style='color:blue'>PIPE_SIZE</span></u>(inode) ((<u><span
style='color:blue'>PIPE_HEAD</span></u>(inode)-<u><span style='color:blue'>PIPE_TAIL</span></u>(inode))&amp;(<u><span
style='color:blue'>PAGE_SIZE</span></u>-1))</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>63</span></u>
#define <u><span style='color:blue'>PIPE_EMPTY</span></u>(inode) (<u><span
style='color:blue'>PIPE_HEAD</span></u>(inode)==<u><span style='color:blue'>PIPE_TAIL</span></u>(inode))</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>64</span></u>
#define <u><span style='color:blue'>PIPE_FULL</span></u>(inode) (<u><span
style='color:blue'>PIPE_SIZE</span></u>(inode)==(<u><span style='color:blue'>PAGE_SIZE</span></u>-1))</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>65</span></u> </span></p>

<p class=a><span lang=EN-US style='color:blue'>&nbsp;<u>66</u></span><span
lang=EN-US> #define <u><span style='color:blue'>NIL_FILP</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
((struct <u><span style='color:blue'>file</span></u> *)0)&nbsp;&nbsp; // </span>空文件结构指针。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>67</span></u>
#define <u><span style='color:blue'>SEL_IN</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
1</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>68</span></u>
#define <u><span style='color:blue'>SEL_OUT</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
2</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>69</span></u>
#define <u><span style='color:blue'>SEL_EX</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
4</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>70</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>71</span></u>
typedef char <u><span style='color:blue'>buffer_block</span></u>[<u><span
style='color:blue'>BLOCK_SIZE</span></u>];&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>块缓冲区。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>72</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>缓冲块头数据结构。（极为重要！！！）</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>在程序中常用<span
lang=EN-US>bh</span>来表示<span lang=EN-US>buffer_head</span>类型的缩写。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>73</span></u>
struct <u><span style='color:blue'>buffer_head</span></u> {</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>74</span></u> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;char
*
b_data;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<b><i>/* pointer to data block (1024 bytes) */</i></b> //</span>指针。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>75</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned long b_blocknr;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b><i>/* block
number */</i></b>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>块号。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>76</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned short
b_dev;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b><i>/*
device (0 = free) */</i></b>&nbsp; // </span>数据源的设备号。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>77</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned char b_uptodate;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>更新标志：表示数据是否已更新。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>78</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned char
b_dirt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b><i>/*
0-clean,1-dirty */</i></b> //</span>修改标志<span lang=EN-US>:0</span>未修改<span
lang=EN-US>,1</span>已修改<span lang=EN-US>.</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>79</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned char b_count;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b><i>/*
users using this block */</i></b>&nbsp;&nbsp; // </span>使用的用户数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>80</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned char
b_lock;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <b><i>/* 0
- ok, 1 -locked */</i></b>&nbsp; // </span>缓冲区是否被锁定。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>81</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>task_struct</span></u> * b_wait;&nbsp;&nbsp;&nbsp;
// </span>指向等待该缓冲区解锁的任务。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>82</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>buffer_head</span></u> * b_prev;&nbsp;&nbsp;&nbsp;
// hash</span>队列上前一块（这四个指针用于缓冲区的管理）。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>83</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>buffer_head</span></u> * b_next;&nbsp;&nbsp;&nbsp;
// hash</span>队列上下一块。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>84</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>buffer_head</span></u> * b_prev_free;&nbsp;&nbsp;
// </span>空闲表上前一块。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>85</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
struct <u><span style='color:blue'>buffer_head</span></u> * b_next_free;&nbsp;&nbsp;
// </span>空闲表上下一块。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>86</span></u> };</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>87</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>磁盘上的索引节点<span
lang=EN-US>(i</span>节点<span lang=EN-US>)</span>数据结构。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>88</span></u>
struct <u><span style='color:blue'>d_inode</span></u> {</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>89</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned short i_mode;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件类型和属性<span
lang=EN-US>(rwx</span>位<span lang=EN-US>)</span>。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>90</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned short i_uid;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>用户<span
lang=EN-US>id</span>（文件拥有者标识符）。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>91</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned long i_size;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件大小（字节数）。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>92</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned long i_time;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>修改时间（自<span
lang=EN-US>1970.1.1:0</span>算起，秒）。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>93</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned char i_gid;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>组<span
lang=EN-US>id(</span>文件拥有者所在的组<span lang=EN-US>)</span>。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>94</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned char i_nlinks;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>链接数（多少个文件目录项指向该<span
lang=EN-US>i</span>节点）。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>95</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned short i_zone[9];&nbsp;&nbsp;&nbsp;&nbsp; // </span>直接<span lang=EN-US>(0-6)</span>、间接<span
lang=EN-US>(7)</span>或双重间接<span lang=EN-US>(8)</span>逻辑块号。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// zone</span>是区的意思，可译成区段，或逻辑块。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>96</span></u> };</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>97</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>这是在内存中的<span
lang=EN-US>i</span>节点结构。前<span lang=EN-US>7</span>项与<span lang=EN-US>d_inode</span>完全一样。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>98</span></u>
struct <u><span style='color:blue'>m_inode</span></u> {</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>99</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
unsigned short i_mode;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件类型和属性<span
lang=EN-US>(rwx</span>位<span lang=EN-US>)</span>。</p>

<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
i_uid;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>用户<span
lang=EN-US>id</span>（文件拥有者标识符）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned long
i_size;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件大小（字节数）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned long
i_mtime;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>修改时间（自<span
lang=EN-US>1970.1.1:0</span>算起，秒）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned char
i_gid;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>组<span
lang=EN-US>id(</span>文件拥有者所在的组<span lang=EN-US>)</span>。</p>

<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned char
i_nlinks;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件目录项链接数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
i_zone[9];&nbsp;&nbsp;&nbsp;&nbsp; // </span>直接<span lang=EN-US>(0-6)</span>、间接<span
lang=EN-US>(7)</span>或双重间接<span lang=EN-US>(8)</span>逻辑块号。</p>

<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
lang=EN-US> <b><i>/* these are in memory also */</i></b></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>107</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>task_struct</span></u> * i_wait;&nbsp; // </span>等待该<span
lang=EN-US>i</span>节点的进程。</p>

<p class=a><u><span lang=EN-US style='color:blue'>108</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>task_struct</span></u> * i_wait2;&nbsp;&nbsp; <b><i>/* for
pipes */</i></b></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned long
i_atime;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>最后访问时间。</p>

<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned long i_ctime;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// i</span>节点自身修改时间。</p>

<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
i_dev;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // i</span>节点所在的设备号。</p>

<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
i_num;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // i</span>节点号。</p>

<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
i_count;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // i</span>节点被使用的次数，<span
lang=EN-US>0</span>表示该<span lang=EN-US>i</span>节点空闲。</p>

<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned char
i_lock;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>锁定标志。</p>

<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned char
i_dirt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>已修改<span
lang=EN-US>(</span>脏<span lang=EN-US>)</span>标志。</p>

<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned char
i_pipe;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>管道标志。</p>

<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned char
i_mount;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>安装标志。</p>

<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned char
i_seek;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>搜寻标志<span
lang=EN-US>(lseek</span>时<span lang=EN-US>)</span>。</p>

<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned char
i_update;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;// </span>更新标志。</p>

<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
lang=EN-US> };</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
lang=EN-US> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>文件结构（用于在文件句柄与<span
lang=EN-US>i</span>节点之间建立关系）</p>

<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
lang=EN-US> struct <u><span style='color:blue'>file</span></u> {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
f_mode;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件操作模式（<span
lang=EN-US>RW</span>位）</p>

<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
f_flags;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件打开和控制的标志。</p>

<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
f_count;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>对应文件引用计数值。</p>

<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>m_inode</span></u> * f_inode;&nbsp;&nbsp;&nbsp;&nbsp; // </span>指向对应<span
lang=EN-US>i</span>节点。</p>

<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <u><span
style='color:blue'>off_t</span></u> f_pos;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>文件位置（读写偏移值）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
lang=EN-US> };</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
lang=EN-US> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>内存中磁盘超级块结构。</p>

<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
lang=EN-US> struct <u><span style='color:blue'>super_block</span></u> {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_ninodes;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>节点数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_nzones;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>逻辑块数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_imap_blocks;&nbsp;&nbsp; // i</span>节点位图所占用的数据块数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_zmap_blocks;&nbsp;&nbsp; // </span>逻辑块位图所占用的数据块数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_firstdatazone; // </span>第一个数据逻辑块号。</p>

<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_log_zone_size; // log(</span>数据块数<span lang=EN-US>/</span>逻辑块<span
lang=EN-US>)</span>。（以<span lang=EN-US>2</span>为底）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned long
s_max_size;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件最大长度。</p>

<p class=a><u><span lang=EN-US style='color:blue'>138</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_magic;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件系统魔数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>139</span></u><span
lang=EN-US> <b><i>/* These are only in memory */</i></b></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>buffer_head</span></u> * s_imap[8]; // i</span>节点位图缓冲块指针数组<span
lang=EN-US>(</span>占用<span lang=EN-US>8</span>块，可表示<span
 lang=EN-US>64M</span><span lang=EN-US>)</span>。</p>

<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>buffer_head</span></u> * s_zmap[8]; // </span>逻辑块位图缓冲块指针数组（占用<span
lang=EN-US>8</span>块）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_dev;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>超级块所在的设备号。</p>

<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>m_inode</span></u> * s_isup;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>被安装的文件系统根目录的<span lang=EN-US>i</span>节点。<span lang=EN-US>(isup-super
i)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>m_inode</span></u> * s_imount;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>被安装到的<span lang=EN-US>i</span>节点。</p>

<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned long s_time;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>修改时间。</p>

<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>task_struct</span></u> * s_wait;&nbsp;&nbsp;&nbsp; // </span>等待该超级块的进程。</p>

<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned char
s_lock;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>被锁定标志。</p>

<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned char
s_rd_only;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>只读标志。</p>

<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned char
s_dirt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>已修改<span
lang=EN-US>(</span>脏<span lang=EN-US>)</span>标志。</p>

<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
lang=EN-US> };</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
lang=EN-US> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>磁盘上超级块结构。上面<span
lang=EN-US>125-132</span>行完全一样。</p>

<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
lang=EN-US> struct <u><span style='color:blue'>d_super_block</span></u> {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_ninodes;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>节点数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_nzones;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>逻辑块数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_imap_blocks;&nbsp;&nbsp; // i</span>节点位图所占用的数据块数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short s_zmap_blocks;&nbsp;&nbsp;
// </span>逻辑块位图所占用的数据块数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_firstdatazone; // </span>第一个数据逻辑块。</p>

<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_log_zone_size; // log(</span>数据块数<span lang=EN-US>/</span>逻辑块<span
lang=EN-US>)</span>。（以<span lang=EN-US>2</span>为底）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned long
s_max_size;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>文件最大长度。</p>

<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
s_magic;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;// </span>文件系统魔数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
lang=EN-US> };</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
lang=EN-US> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>文件目录项结构。</p>

<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
lang=EN-US> struct <u><span style='color:blue'>dir_entry</span></u> {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned short
inode;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // i</span>节点号。</p>

<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; char name[<u><span
style='color:blue'>NAME_LEN</span></u>];&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>文件名，长度<span lang=EN-US>NAME_LEN=14</span>。</p>

<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
lang=EN-US> };</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
lang=EN-US> </span></p>

<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>m_inode</span></u> <u><span
style='color:blue'>inode_table</span></u>[<u><span style='color:blue'>NR_INODE</span></u>];&nbsp;&nbsp;&nbsp;&nbsp;
// </span>定义<span lang=EN-US>i</span>节点表数组（<span lang=EN-US>32</span>项）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>file</span></u> <u><span
style='color:blue'>file_table</span></u>[<u><span style='color:blue'>NR_FILE</span></u>];&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>文件表数组（<span lang=EN-US>64</span>项）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>super_block</span></u> <u><span
style='color:blue'>super_block</span></u>[<u><span style='color:blue'>NR_SUPER</span></u>];
// </span>超级块数组（<span lang=EN-US>8</span>项）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>buffer_head</span></u> * <u><span
style='color:blue'>start_buffer</span></u>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>缓冲区起始内存位置。</p>

<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
lang=EN-US> extern int <u><span style='color:blue'>nr_buffers</span></u>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>缓冲块数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
lang=EN-US> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>磁盘操作函数原型。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>检测驱动器中软盘是否改变。</p>

<p class=a><u><span lang=EN-US style='color:blue'>174</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>check_disk_change</span></u>(int
dev);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>检测指定软驱中软盘更换情况。如果软盘更换了则返回<span
lang=EN-US>1</span>，否则返回<span lang=EN-US>0</span>。</p>

<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
lang=EN-US> extern int <u><span style='color:blue'>floppy_change</span></u>(unsigned
int nr);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>设置启动指定驱动器所需等待的时间（设置等待定时器）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
lang=EN-US> extern int <u><span style='color:blue'>ticks_to_floppy_on</span></u>(unsigned
int dev);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>启动指定驱动器。</p>

<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>floppy_on</span></u>(unsigned
int dev);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>关闭指定的软盘驱动器。</p>

<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>floppy_off</span></u>(unsigned
int dev);</span></p>

<p class=a><span lang=EN-US>&nbsp;</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>以下是文件系统操作管理用的函数原型。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>将<span lang=EN-US>i</span>节点指定的文件截为<span
lang=EN-US>0</span>。</p>

<p class=a><u><span lang=EN-US style='color:blue'>179</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>truncate</span></u>(struct <u><span
style='color:blue'>m_inode</span></u> * inode);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>刷新<span lang=EN-US>i</span>节点信息。</p>

<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>sync_inodes</span></u>(void);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>等待指定的<span lang=EN-US>i</span>节点。</p>

<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>wait_on</span></u>(struct <u><span
style='color:blue'>m_inode</span></u> * inode);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>逻辑块<span lang=EN-US>(</span>区段，磁盘块<span
lang=EN-US>)</span>位图操作。取数据块<span lang=EN-US>block</span>在设备上对应的逻辑块号。</p>

<p class=a><u><span lang=EN-US style='color:blue'>182</span></u><span
lang=EN-US> extern int <u><span style='color:blue'>bmap</span></u>(struct <u><span
style='color:blue'>m_inode</span></u> * inode,int block);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>创建数据块<span lang=EN-US>block</span>在设备上对应的逻辑块，并返回在设备上的逻辑块号。</p>

<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
lang=EN-US> extern int <u><span style='color:blue'>create_block</span></u>(struct
<u><span style='color:blue'>m_inode</span></u> * inode,int block);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>获取指定路径名的<span
lang=EN-US>i</span>节点号。</p>

<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>m_inode</span></u> * <u><span
style='color:blue'>namei</span></u>(const char * pathname);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>取指定路径名的<span
lang=EN-US>i</span>节点，不跟随符号链接。</p>

<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>m_inode</span></u> * <u><span
style='color:blue'>lnamei</span></u>(const char * pathname);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp; &nbsp;// </span>根据路径名为打开文件操作作准备。</p>

<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
lang=EN-US> extern int <u><span style='color:blue'>open_namei</span></u>(const
char * pathname, int flag, int mode,</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>187</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct <u><span
style='color:blue'>m_inode</span></u> ** res_inode);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>释放一个<span lang=EN-US>i</span>节点<span
lang=EN-US>(</span>回写入设备<span lang=EN-US>)</span>。</p>

<p class=a><u><span lang=EN-US style='color:blue'>188</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>iput</span></u>(struct <u><span
style='color:blue'>m_inode</span></u> * inode);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>从设备读取指定节点号的一个<span
lang=EN-US>i</span>节点。</p>

<p class=a><u><span lang=EN-US style='color:blue'>189</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>m_inode</span></u> * <u><span
style='color:blue'>iget</span></u>(int dev,int nr);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>从<span lang=EN-US>i</span>节点表<span
lang=EN-US>(inode_table)</span>中获取一个空闲<span lang=EN-US>i</span>节点项。</p>

<p class=a><u><span lang=EN-US style='color:blue'>190</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>m_inode</span></u> * <u><span
style='color:blue'>get_empty_inode</span></u>(void);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>获取（申请一）管道节点。返回为<span
lang=EN-US>i</span>节点指针（如果是<span lang=EN-US>NULL</span>则失败）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>191</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>m_inode</span></u> * <u><span
style='color:blue'>get_pipe_inode</span></u>(void);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>在哈希表中查找指定的数据块。返回找到块的缓冲头指针。</p>

<p class=a><u><span lang=EN-US style='color:blue'>192</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>buffer_head</span></u> * <u><span
style='color:blue'>get_hash_table</span></u>(int dev, int block);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>从设备读取指定块（首先会在<span
lang=EN-US>hash</span>表中查找）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>buffer_head</span></u> * <u><span
style='color:blue'>getblk</span></u>(int dev, int block);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>读<span lang=EN-US>/</span>写数据块。</p>

<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>ll_rw_block</span></u>(int
rw, struct <u><span style='color:blue'>buffer_head</span></u> * bh);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>读<span lang=EN-US>/</span>写数据页面，即每次<span
lang=EN-US>4</span>块数据块。</p>

<p class=a><u><span lang=EN-US style='color:blue'>195</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>ll_rw_page</span></u>(int
rw, int dev, int nr, char * buffer);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>释放指定缓冲块。</p>

<p class=a><u><span lang=EN-US style='color:blue'>196</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>brelse</span></u>(struct <u><span
style='color:blue'>buffer_head</span></u> * <u><span style='color:blue'>buf</span></u>);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>读取指定的数据块。</p>

<p class=a><u><span lang=EN-US style='color:blue'>197</span></u><span
lang=EN-US style='color:blue'> </span><span lang=EN-US>extern struct <u><span
style='color:blue'>buffer_head</span></u> * <u><span style='color:blue'>bread</span></u>(int
dev,int block);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>读<span lang=EN-US>4</span>块缓冲区到指定地址的内存中。</p>

<p class=a><u><span lang=EN-US style='color:blue'>198</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>bread_page</span></u>(unsigned
long addr,int dev,int b[4]);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>读取头一个指定的数据块，并标记后续将要读的块。</p>

<p class=a><u><span lang=EN-US style='color:blue'>199</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>buffer_head</span></u> * <u><span
style='color:blue'>breada</span></u>(int dev,int block,...);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>向设备<span lang=EN-US>dev</span>申请一个磁盘块（区段，逻辑块）。返回逻辑块号</p>

<p class=a><u><span lang=EN-US style='color:blue'>200</span></u><span
lang=EN-US> extern int <u><span style='color:blue'>new_block</span></u>(int
dev);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>释放设备数据区中的逻辑块<span
lang=EN-US>(</span>区段，磁盘块<span lang=EN-US>)block</span>。复位指定逻辑块<span
lang=EN-US>block</span>的逻辑块位图比特位。</p>

<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>free_block</span></u>(int
dev, int block);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>为设备<span lang=EN-US>dev</span>建立一个新<span
lang=EN-US>i</span>节点，返回<span lang=EN-US>i</span>节点号。</p>

<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>m_inode</span></u> * <u><span
style='color:blue'>new_inode</span></u>(int dev);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>释放一个<span lang=EN-US>i</span>节点（删除文件时）。</p>

<p class=a><u><span lang=EN-US style='color:blue'>203</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>free_inode</span></u>(struct
<u><span style='color:blue'>m_inode</span></u> * inode);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>刷新指定设备缓冲区。</p>

<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
lang=EN-US> extern int <u><span style='color:blue'>sync_dev</span></u>(int
dev);</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>读取指定设备的超级块。</p>

<p class=a><u><span lang=EN-US style='color:blue'>205</span></u><span
lang=EN-US> extern struct <u><span style='color:blue'>super_block</span></u> * <u><span
style='color:blue'>get_super</span></u>(int dev);</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
lang=EN-US> extern int <u><span style='color:blue'>ROOT_DEV</span></u>;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
lang=EN-US> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>安装根文件系统。</p>

<p class=a><u><span lang=EN-US style='color:blue'>208</span></u><span
lang=EN-US> extern void <u><span style='color:blue'>mount_root</span></u>(void);</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
lang=EN-US> </span></p>

<p class=a><u><span lang=EN-US style='color:blue'>210</span></u><span
lang=EN-US> #endif</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
lang=EN-US> </span></p>

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